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Spiral DRAGNs

Here be Spiral DRAGNs

Total Cost €


EC-Contrib. €






Project "Spiral DRAGNs" data sheet

The following table provides information about the project.


Organization address
address: OXFORD ROAD
postcode: M13 9PL

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country United Kingdom [UK]
 Total cost 183˙454 €
 EC max contribution 183˙454 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2014
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2016
 Duration (year-month-day) from 2016-05-01   to  2018-10-28


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

Until recently, it was thought that large double-lobed radio sources are always hosted by massive elliptical galaxies in the local Universe and that the merger phenomenon responsible for the elliptical morphology is also responsible for triggering the AGN. Consequently, the existence of spiral galaxies that host double-lobed radio sources (“spiral DRAGNs”) is inconsistent with leading galaxy formation models. However, these systems have been confirmed to exist, calling into question our current understanding of galaxy formation. This project aims to establish the role of these systems in galaxy formation: either reconciling their existence with current models or challenging the idea of the standard feedback model. I propose a multi-pronged approach to this project: First, I will study the parsec-scale environment in the immediate vicinity of the AGN and determine whether properties of the central black hole in these spiral hosts are similar to those of the black holes hosted by elliptical galaxies; Second, I will study the megaparsec-scale environment of spiral DRAGNs to determine whether their environment is responsible for their unique nature. I will achieve the first science goal using Very Long Baseline Interferometry (VLBI) radio observations. I will achieve the second science goal using a combination of archival and new data at multiple wavelengths. Together these two science goals will enable us to definitively determine whether spiral DRAGNs are a result of the intrinsic properties of the black hole, a result of their large-scale environment, or a combination of both these factors. Furthermore, I will exploit my role as lead for the Radio Galaxy Zoo project on spiral DRAGNs to find more of these sources. To-date there have been only four spiral DRAGNs detected. Increasing the sample size is imperative for testing the hypotheses that will be formed in the above two science goals, and enable statistically significant conclusions to be drawn.


year authors and title journal last update
List of publications.
2018 B H C Emonts, M D Lehnert, H Dannerbauer, C De Breuck, M Villar-Martín, G K Miley, J R Allison, B Gullberg, N A Hatch, P Guillard, M Y Mao, R P Norris
Giant galaxy growing from recycled gas: ALMA maps the circumgalactic molecular medium of the Spiderweb in [C i]
published pages: L60-L65, ISSN: 1745-3933, DOI: 10.1093/mnrasl/sly034
Monthly Notices of the Royal Astronomical Society: Letters 477/1 2019-06-18
2018 Minnie Y Mao, Jay M Blanchard, Frazer Owen, Loránt O Sjouwerman, Vikram Singh, Anna Scaife, Zsolt Paragi, Ray P Norris, Emmanuel Momjian, Gia Johnson, Ian Browne
The first VLBI detection of a spiral DRAGN core
published pages: L99-L104, ISSN: 1745-3933, DOI: 10.1093/mnrasl/sly081
Monthly Notices of the Royal Astronomical Society: Letters 478/1 2019-06-18
2016 D. D. Mulcahy, M. Y. Mao, I. Mitsuishi, A. M. M. Scaife, A. O. Clarke, Y. Babazaki, H. Kobayashi, R. Suganuma, H. Matsumoto, Y. Tawara
Discovery of a low-luminosity spiral DRAGN
published pages: L8, ISSN: 0004-6361, DOI: 10.1051/0004-6361/201629536
Astronomy & Astrophysics 595 2019-06-18
2016 B. H. C. Emonts, M. D. Lehnert, M. Villar-Martin, R. P. Norris, R. D. Ekers, G. A. van Moorsel, H. Dannerbauer, L. Pentericci, G. K. Miley, J. R. Allison, E. M. Sadler, P. Guillard, C. L. Carilli, M. Y. Mao, H. J. A. Rottgering, C. De Breuck, N. Seymour, B. Gullberg, D. Ceverino, P. Jagannathan, J. Vernet, B. T. Indermuehle
Molecular gas in the halo fuels the growth of a massive cluster galaxy at high redshift
published pages: 1128-1130, ISSN: 0036-8075, DOI: 10.1126/science.aag0512
Science 354/6316 2019-06-18

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